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PFO
Abbreviation for patent foramen ovale. It is a form of congenital heart
defect that enables blood flow between the left and right atria via the in-
teratrial septum.
PO
2
Abbreviation for oxygen partial pressure.
RGBM
Abbreviation for Reduced Gradient Bubble Model.
Reduced Gradient Bubble Model
Modern algorithm for tracking both dissolved andfree gas in divers.
Repetitive dive
Any divewhose decompression timelimits are affectedby residual nitro-
gen absorbed during previous dives.
Residual nitrogen
The amount of excess nitrogen remaining in a diver after one or more
dives.
SURF TIME
Abbreviation for surface interval time.
Surface interval time
Elapsed timebetween surfacing froma dive andbeginning adescent for
the subsequent repetitive dive.
Tissue group
Theoretical concept used to model bodily tissues for the construction of
decompression tables or calculations.
UHMS
Abbreviation for Undersea and Hyperbaric Medical Society.
Whole-body toxicity
Another form of oxygen toxicity, which is caused by prolongedexposure
to highoxygen partialpressures. Themost commonsymptoms areirrita-
tion inthe lungs,a burningsensation inthe chest,coughing andreduction
of the vital capacity. Also called Pulmonary Oxygen Toxicity. See also
OTU.
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